# Hall-Petch Relation Calculation?

Using the Hall-Petch relation, estimate the yield strength, σy, of a Cu-Zn alloy (brass) when the average grain diameter is 30 μm.

where:

σy = is the yield strength

￼￼σ0 = 25 MPa is the internal friction stress

k_{y} = 12.5 MPa·mm^{1/2} is a material constant

d = is the average grain size

I get an answer of 97.17 MPa, is this correct, if not i’ll post all of my working. Thanks!

http://ift.tt/1ja9m9r

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